No Southern trains between Clapham Junction and Watford Junction until approximately 14:45 

Route(s) affected

Between East Croydon and Watford Junction

Description

A fault with the signalling system between Shepherds Bush and Wembley Central means the lines used by Southern services are blocked. All stations between Clapham Junction and Watford Junction will not be served.

If you are travelling between East Croydon and Clapham Junction, these stations will be served by alternative Southern services.

This is expected until approximately 14:45.

Customer advice:

No trains can run between Clapham Junction and Watford Junction until further notice. You will need to use an alternative route to reach your destination. You should allow at least an additional 45 minutes to complete your journey today.

Please talk to station staff, look at the information boards or check your journey planner for the most recent information.

How are we changing our service?

While this disruption is ongoing, we will be making the following changes to services:

Trains that normally run between East Croydon and Watford Junction be cancelled until the line is repaired.

The following stations will not be served by Southern services:

• Imperial Wharf

• West Brompton

• Kensington Olympia

• Shepherds Bush

• Wembley Central

• Harrow & Wealdstone

• Watford Junction

How do I get from Clapham Junction to Wembley Central, Harrow & Wealdstone or Watford Junction?

If you are travelling to one of these stations the quickest way from Clapham Junction is to travel to London Victoria on an alternative Southern service. From there you can get the direct London Underground Victoria line to London Euston. At London Euston you can catch either a London Overground or London Northwestern Railway service to reach your destination.

Please be aware this could take up to an additional 45 minutes longer than usual

How do I get from Clapham Junction towards Shepherds Bush?

If you require any of the stops from Clapham Junction towards Shepherds Bush then you should catch a London Overground service direct to your destination.

Please be aware this will take up to an additional 30 minutes longer than usual.

Can I use my ticket with another operator?

You can travel on the following services at no additional cost;

• Alternative Southern services via Clapham Junction

• London Northwestern Railway between London Euston and Watford Junction

• Chiltern Railways between London Marylebone, Harrow-on-the-Hill and Wembley Stadium

• London Overground between Clapham Junction, London Euston, Willesden Junction and Watford Junction

• London Underground between London terminals

• London Buses between Clapham Junction, London and Watford Junction

Planning your journey:

You can use live departure boards, a live map of the network and the alternative route guide to help you.

If you're travelling in the London area, you can plan journeys on alternative routes by using the TfL Journey Planner.

Can you tell me more about the incident?

A signalling fault known as "route locking" is causing disruption to your journey in this area.

This part of the network uses track circuits to detect the position of trains. These are electrical systems which monitor whether a train is on a section of track. Track circuits operate as part of the signalling system, which is designed to be "fail safe".

When a track circuit fails, the signalling system will interpret this as a train remaining in place, even though there may not be a train present at all, or the previous service may have long since left the area.

In the case of track circuits at junctions, this means the points cannot be moved, as there could still be a train present. As a result, the junction will become route locked. The junction will then only be able to be used for trains running on the route which was selected when the system failed.

Until the track circuit clears, it won't be possible for your train to pass the area as usual, and if the route is locked, it may mean your train cannot reach its normal destination. Because this type of fault can result in a queue of trains waiting to continue, even if your own route is open, there can still be disruption to your journey.

Network Rail staff will be attending as quickly as possible to resolve the fault and make sure all of the affected trains can move.

Check before you travel:

You can check your journey using the National Rail Enquiries real-time Journey Planner.

Compensation:

You may be entitled to compensation if you experience a delay in completing your journey today. Please keep your train ticket and make a note of your journey, as both will be required to support any claim.